add samples to ASAR dddb
reuse resource
update envisat orbit file reading
optimize selection of reader
add ASAR 4C spec
add getBandlinereader from map
determine tie point grid more precisely
formating
Merge branch 'envisat-reader' of https://github.com/lveci/beam into lveci-envisat-reader

Conflicts:
	beam-envisat-reader/src/main/java/org/esa/beam/dataio/envisat/EnvisatOrbitReader.java
Merge branch 'envisat-reader' of https://github.com/lveci/beam into lveci-envisat-reader

Conflicts:
	beam-envisat-reader/src/main/java/org/esa/beam/dataio/envisat/EnvisatOrbitReader.java